According to our information, the four camps of the medicine woman was the rule in olden times and a hundred-willow sweathouse was made at each camp. In recent times, but two moves seem to have been made; the first day marking the move from the regular home camp to the temporary one where the second day is also spent. But one of the hundred-willow sweathouses is now made--the one on the third day. Also, where formerly they used the ordinary type of sweathouse, at the close of the fourth day, the men now return to the hundred-willow sweathouse. The time then was "when the service berries are ripe", perhaps August, instead of Fourth-of-July week, as in recent years.[2] Even the fast is much abbreviated, usually but of two days' duration. FOOTNOTES: [1] As in many other cases, there is a difference of opinion as to what was, or is, the correct schedule. Some maintain that the timber and sun pole are brought in on the fourth day and the fifth day given over to the erection of the dancing lodge only. This is, however, a matter of no great moment. [2] See Grinnell, George Bird, _Blackfoot Lodge Tales_ (New York, 1903), 264, for program. THE VOW. The most important functionary in the Blackfoot sun dance is a woman, known among the whites as the medicine woman, and upon a clear comprehension of her functions and antecedents depends our understanding of the ceremony itself. Accordingly, we shall proceed with as complete an exposition of her office as the information at hand allows. In the first place, a sun dance cannot occur unless some woman qualifies for the office. On the other hand, it was almost inconceivable that there should be a summer in which such a qualification would not be made. This attitude of our informants implies that public opinion had sufficient force to call out volunteers against their own wills. There was a feeling that an annual sun dance was, from a religious and ethical point of view, necessary to the general welfare, for which some individual ought to sacrifice personal comfort and property to the extent required by custom. As we shall see later, this was no small price to pay for a doubtful honor. This feeling was sure to express itself in the subtle ways peculiar to Indian society, if need be, to the direct suggestion of a candidate who in turn felt impelled to come forward as if prompted entirely from within.